Lieutenant Junior Grade Susumu Yamazaki is the assistant engineer and damage control officer aboard the Yamato, a 45-year-old veteran from Kumamoto Prefecture tasked with safeguarding the vessel’s survival. During combat, he spearheads damage-control operations, swiftly mitigating crises to halt the ship’s deterioration. Collaborating closely with Chief Engineer Hikozaemon Tokugawa, he manages critical engineering duties, their partnership strengthened by mutual trust forged through repeated efforts to stabilize the Yamato under relentless threats.

Yamazaki coordinates routine maintenance and emergency protocols alike, prioritizing structural integrity by deploying repair teams and activating backup systems when vital functions falter. His steady leadership and technical precision during chaotic scenarios cement his role as an indispensable support pillar within the engineering team, though he operates behind the scenes rather than in tactical command.

Details about his life prior to the Yamato’s crew or his portrayal in supplementary media beyond the central narrative remain unrecorded.